advertised).
- `template`: Name of the template to use (if set, the `source` option is
irrelevant).
+- `var_*`: Any argument with a name starting with ``var_`` is transmitted to the template. For instance, if directive has argument ``var_foo=bar``, then the template will have a variable named ``foo``, and ``<TMPL_VAR FOO>`` will be replaced by ``bar``.
### Extensions